Eisfeld did not make a first team appearance for the Bundesliga club but impressed for their Under-19 side this term, netting six goals in 12 appearances.

"Thomas is a player we have liked for some time," said Arsene Wenger. "We’ve watched him closely this season, where he has excelled for Dortmund’s youth team.

"He is young but has proven to us that he can play, that he has the attitude and technical ability to be a valuable addition to our squad. We’re very pleased to welcome him to the Club and look forward to his contribution in the coming seasons.”

Eisfeld added: "I feel very proud to have signed for Arsenal. This is a great club, with many great players, and I’m so happy to be joining Arsenal.

"It’s a real honour to be team mates with the great players at Arsenal, and also training everyday with players like Tomas Rosicky - who I grew up watching play at Dortmund. I will give it everything I have here and do my best to make the manager, players and fans happy.

"I would also like to thank Borussia Dortmund, where I played for the last seven years, for everything they have done for me. I had a great time there, and there were many wonderful coaches who helped me get to where I am today."

He is young but has proven to us that he can play, that he has the attitude and technical ability to be a valuable addition to our squad